Good Questions: Help Me Insulate My Attic!

AT: It's starting to get chilly in North Carolina, and I'm trying to conserve energy and save money this winter. While I realize that not all AT readers have an attic, some of us do and it would be fantastic if you could do a feature on attic/home insulation. I'm thinking of putting down the pink fiberglass sheets but was wondering if anyone had experience with this. Does it still work if you just do half of your attic floor? We store a lot of boxes up there and need some of the floor space. Any other ideas for saving on energy costs - water heater jackets, etc? Thanks!- Cold in Carolina